The Sitemap XML protocol is also extended to provide a way of listing multiple Sitemaps in a 'Sitemap index' file. The maximum Sitemap size of 50 MiB or 50,000 URLs means this is necessary for large sites. An example of Sitemap index referencing one separate sitemap follows.
Cultural or artificial eutrophication occurs when human activity introduces increased amounts of these nutrients, which speed up plant growth and eventually choke the lake of all of its animal life.n nature, eutrophication is a common phenomenon in freshwater ecosystems and is really a part of the normal aging process of many lakes and ponds. Some never experience it because of a lack of warmth and light, but many do.
Eutrophication Eutrophication is a process in which bodies of water (lakes, ponds, and rivers) receive excess nutrients that stimulate excessive growth of algae. The two most â¦ common nutrients that initiate eutrophication are nitrogen and phosphorous, two limiting nutrients in the growth of algae.These two nutrients are usually introduced to the body of water through fertilizer run-off.utrophication occurs when a body of water has too many phosphates.  The most common source of phosphorus in lakes is from agricultural  run off. The second major cause is n â¦ atural due to high amounts of  organic materials falling to the surface of the water.